Mildred Miller's extensive career included being a principal artist at the Metropolitan Opera from 1951 through 1974. She made her debut at the Met on November 17, 1951, as Cherubino in Wolfgang Amadeus Mozart's The Marriage of Figaro with Cesare Siepi in the title role. She would go on to play this role a record-breaking 61 times at the Met. During her 23 years at the Met, she sang in 338 performances, including the title role in “Carmen,” Suzuki in “Madama Butterfly” and Octavian in “Der Rosenkavalier,” which was said to be her favorite.